Micrometer



pril 24, 1928. 1`,667,562

F. NEUBAUER MI'CROMETER Filed Deo. 21.1926 2 Sheets-Sheet 1 FERnmnNl] N ELJBHUER' Gttomamd April 24, 1928. Y 1,667,562

F. NEUBAUER MICROMETER Filed Dec. 21 1926 2 Sheets-Sheet 2 Inventoz Fmnmnun Nmanulzn An/Mdm `liateinted Apr. 2d, llltl lJNllhll'l WlllhlllES rettete EERUINANIU NEUBAUER, Cm' BRKJL'E'N, 13H10.

MICRME'EER.

Application filed December 21, 1215MB.

`lily invention relates to an improvement in micrometers, and my object in general is to provide u compact und simple .measuring instrumentI havingcertain new and novel features of construction adapted to promote ease of manipulation, accuracy of results. and to give the instrument a, wide range of application, all substantially as herein shown and described and more particularly pointed out in the claims.

In the accompanyingdrawings Fig. 1 is a side elevation of the micron'lcter in a partly open condition. Fig. 2 is a sectional view on line 2-2 of Fig. 1. Fig. 3 is a detail view of a supplemental measuring part which is adapted to be detachably connected to one of the movable jaw members. Fig. l is a sectional view of the operating4 parts, on an enlarged or magnified scale. Fig. 5 is a side view, enlarged, of the central op" crafting and measuring' collar for the feed screw.` Fig. 6 is a side view of said collar and a section of thcscrew. "Fig 7 is a sec* tional view centrally through the handle portion of the instrument on line (-7 of Fig. 1. i Figs. 8 and 9, are end and side views, respectively, of one of the sliding' jaw members. Fig. isa side elevation of the jaw member and its spring locking ring screwed together upon the feed screw.

The invention comprises a forked body 2 having a cylindrical handle 3 depending therefrom. The opposite sides ofA this forked part of body 2 are flat, and the top is flat also and formed witha longitudinal `slot 4l which opens into a round or oval bore 5 eX- tending lengthwise of body 2. Moreover the lower part of body 2 is divided into two parts by a narrow slit 6 extending' downwardly from the bottom of bore 5 into the upper end of handle, and the divided parts may be spread apart or drawn together slightly by screws 7 to eifect adjustments for wearv and to promo-te alignment and smoothness of operation of two slidable measuring members -SH llietransverse opening 9 centrally withinbody 2 contains a solid rotatable disk or wheel 10 which carries two independently rotatable collars 1l and 12, respectively, and two screw-threaded shafts 11l-11l areaflinod to the central part of disk or wheel 10 and extend in opposite Adirections therefrom` to engage andoperate .the slide membersB-S. Shafts 1li-14 are provided with right and left hand screwthreads, respectively, wherewith to slide seriali. no. 15eme.

members 8--8 in opposite directions when l threaded bores 155-15 adapted to receive said shafts. lilach slide 8-8 comprises lateral flanges 16H16 adapted to overlap and engage the flat top of divided body Q, and the circular bore slightly eccentric t0 the cylindrical body part of each slide inember so that whenscrews 'l are tightened the said flanges will be drawn downwardly `in slight degree to establish a snug lit and smooth sliding contact with the flat top of4 body Q. bearings for thc screw-threaded shafts or spindles and their common operating disk or wheel 10, which wheel prevents axial shitt of said spindles because it is confined within the transverse opening 9 in body 2. Each slide member Ele-3' entends upwardly be vond the top of body, and this vertical eirtension is of stepped formation to provide a series of measuring; faces a, b., and c, which are spaced predetermined distances apart.` rflous the exposed upper part of each slide has the appearance of a stepped jaw, and the higher stepped parts 'f7-17 are adapted to overlap the dislr or wheel and bear aga-inst each other in the zero measuring' position of slidesm. The opposed faces a,`of stepped parts 17 17 may be used for `outside measuring purposes and faces 7) and c are for inside measurements. A thirolinside `measurement may be made by using' the Gliv Slides 8-8 provide supporting:

separate removable elements or hardened steelv pins 20 and 21, respectively, see Fig. 4l.` 'lhese hardened pms may be' readily removed and exchanged 1n case of wear, and

pins 21 of different length may be substi* tutcd to simplify readings lfor different measuring; ranges. Gontact element al may be of any desired length, and is held in place by a set screw 19 to permit either longer or shorter elements to be substituted therefor.

To avoid loose play and to taire up the wear on the screwethreads on the slides and screw shafts, l employ a tension nut 24; which is adapted to have rotatable inten locking connection with each slide. Thus,

`thel inner end of the cylindrical body of each slide is serrated radially in respect to the screw shaft, and nut 24 is partly split at kone or more places to provide one or more spring tongues 25 having a projecting extremity adapted to interlock with the scr- Y ratedteeth, see Figs. i and 10.

' tances,l by rotating disk or wheel 10 the requisite number ott times. New assuming the limit ot movement toward each other has been reached and the `iaws 17 17 resist `turther movement, itis obvious that the operator might place considerable stress on the disk to continue the movement and thereby bind the screws or strain the connections. To prevent this from happening, l mount a knurled collar 1l upon disk l0, which collar is ci slightly larger diameter than the disk'to permit the fingers and thumb ot' the operator to grip it instead of the disk. rihis collar occupies a circumferential recess in lone edge of the collar where it may be held in frictional contact with a leather washer 26 by means of a split locking and clamping ring 27, seerFigs. 4t to 6, thus transmitting the applied power trictionally through the ,collar tothe disk or wheel. Obviously colv IaijlI-inaybe rotated independently without bind onthe screws after the slides have reached the limit of their movement. The opposite corner edge of disk l0 is also recessed to continea second collar l2 and A split friction ring 28 therein. However this secondcollar 12 serves a diiicrent purpose,

. in .fact it; serves three `distinct purposes.

determined by a lateral lng 31 on the col vlar and two stops 532-32 on body 2, or more First, disk l0 bears on its circumtereiices graduations 29 representing subdivisions ot the measuring scales 30 on the sides of body 2, whereby the degree of rotation of the disk may beindicated and readings ot' Vone-thousandth oit' an inch may Vbe easily denoted. Secondly, collar '12 bears aI zero mark and VVernier graduations to further subdivide the readings. Thirdly, th-e collar l2 bearing the zero mark is Vadapted to have a limited eoiiipensating or resettingmovement in respect to diskl() to make up for lost motion in reversing the direction of movemcntot the screws and slides., thus promoting absolute accuracy'in obtaining readings tor both inside and outside measurements. The conipensating movement of collar l2 is fixed or rprrectly speaking; stops .32 .are integral parts 'ot a plate 33 secured tobody 2 adjacent dlsk 10and collar 12, see Figs. l, 5, and 7. An-

,A other advantage ot having a Vernier collar rotatably related to fixed stops on the body.

is that the measuring jaws may be reversed to release their grip on the work and the :instrument may be then removed and inneer/geen spected without disturbing the setting of the vernici' collar in respect to the graduated disk. This may be done because the collar is irictionally engaged with the disk and will more the disk and not change the set-- ling until the lug 3l cn the collar strikes a stop To hermit exact sett-ing and adjustment ci. the sliding jaw members n--b l pieler lo use two separate screw shails V)fl-mii and secure them separately within the center ot disk lO, as Ytollows: lilach scrc\\'lhreaded shaft has a slotted outer end adapted to be engaged b5; a screw driver to permit al* tachment and detachment and also adjustment tliereo't" in respect to a thin wedgeshaped piece Bil; which is adapted to be interposed between the inner eiiils ot the screw shafts, see Fig. si. .fr set screw 35 extends through the periphery oit' disk l() into bearing' engagement with wedge Ill. and the screw shafts may be clamped tightly in their threaded seats iii` the dial-I by means ot this .set screw and `the wedge. Each .sei-ew sha'l't may also he rotated when unlocked lo permit longitudinal adjustment ther/aol' and slightly changed settings ot the measuring slides 8--8 relatively to each other.

.l also provide means for locking disk l() against rotative movement aflter adjusting oil setting the slides, which means comprises a screw-threaded rod 3G ce1-:tending centrally through handle 3 where the inner end of the rod may be clamped against the periphery oi disk 10. A. knurled `head 37 on the outer end ot the rod permits convenient operating control ot this disk locking member.

What l claim, is:

l. A micrometer, comprising a pair of movable jaw members having stepped contact places for inside and outside measuring purposes, means tor shitting said members, and measuring means `tor the movement oit said jaw members, including a Zero marking element shittable in limits in respect to said measuring means and adapted to compensate for lost motion in said parts and promote accurate readings for both inside and outside measurements.

2. A. micrometer, comprising a handle, movable measuring members supported by said handle having inside and outside gaging places, and operating means upon said handle 'for said measuring members, including a zero-marking device shittablc in respect to said operating means to different fixed positions for inside and outside ga ging.

3. A micrometer, comprising a. handle having a slotted top and an elongated opening in said top, screw shafts within said opening, elongated measuring members longitudinally slidable supported on the top of said handle, extensions on said measuring member extending into the slotted part ot said top portion in screw engagement with Y indicating member said screw shafts in said opening, and means for rotating said shafts.

4. A micrometer, comprising a handle having a forked top portion, movable 1neasuring members slidably mounted upon said top, revcrsely-threaded screw shafts having operating connection with said members, and a graduated disk exposed at the middle of said forked top adapted to operate said screw shafts.

5. In a micrometer, movable measuring members, and an operating member tor said measuring members including a pair of screw-threaded shafts longitudinally adjust able lixed in said operating member, to permit changes in settings ot' said measuring members relatively to each other.

6. In a micrometer, measuring members and rotatable devices itor shifting the same, including a graduated disk and a collar rotatably mounted upon said disk but trictionally engaged therewith, said collar having an index mark therein associated with the graduations on said disk.

7. In a micrometer, measuring members, an operating screw for said members, a

. graduated disk connected with said screw, a

Jfrictional operating collar for `said disk, an frictionally engaged with said disk and xed stops for said indicating member to permit limited shifting of said indicating member by said disk.

8. A micrometer, comprising a handle, movable measuring members supported and guided by said handle, a screw conined within said handle having screw engagement with said members, a graduated open ating wheel for said screw, a compensating lindex member frictionally engaged with said disk, and stops on said handle adapted to limit the movement of said index member upon rotatable movements imparted thereto by said disk.

9. A micrometer, comprising a handle having a flat top portion, a longitudinal downwardly extending slit in said top portion having an enlargement to provide a 1011- gitudinal opening in said slit, movable jaw members slidably supported upon said flat top portion, said jaw members having cylindrical downwardly extending body parts adjustably held in said longitudinal opening and means for claniping the slitted parts of said handle together ttor drawing said movable jaw members downwardly upon said flat top portion in case of wear.

In testimony whereof I affix my signature.

FERDINAND NEUBAUER. 

